Walking stick adaptor



FIG. 1 is a perspective view of the present design for a walking stick adaptor;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side view being of the same appearance; and,

FIG. 4 is a rear view thereof.

The broken lines in all views are included for the purpose of illustrating a portion of the walking stick adaptor that forms no part of the claimed design. 

The ornamental design for a walking stick adaptor, as shown and described. 